Chinese Journal of Catalysis ›› 2025, Vol. 76: 37-49.DOI: 10.1016/S1872-2067(25)64780-2

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Self-floating Bi4O5Br2/P-doped C3N4/carbon fiber cloth with S-scheme heterostructure for boosted photocatalytic removal of emerging organic contaminants

Shijie Lia,b,*(), Rui Lia, Kexin Donga, Yanping Liua, Xin Yub, Wenyao Lic, Tong Liud, Zaiwang Zhaoe, Mingyi Zhangf,*(), Bin Zhanga,*(), Xiaobo Cheng   

  1. aZhejiang Key Laboratory of Pollution Control for Port-Petrochemical Industry, National Engineering Research Center for Marine Aquaculture, Zhejiang Ocean University, Zhoushan 316022, Zhejiang, China
    bHenan Engineering Research Center of Resource & Energy Recovery from Waste, School of Energy Science and Technology, Henan University, Zhengzhou 450046, Henan, China
    cSchool of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
    dKey Laboratory of Green Chemical Process, Ministry of Education, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, Hubei, China
    eCollege of Energy Materials and Chemistry, College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010070, Inner Mongolia, China
    fKey Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, Heilongjiang, China
    gDivision of Energy, Matter, and Systems, School of Science and Engineering, University of Missouri-Kansas City, Kansas City, MO 64110, USA
  • Received:2025-04-04 Accepted:2025-07-02 Online:2025-09-18 Published:2025-09-10
  • Contact: Shijie Li, Mingyi Zhang, Bin Zhang
  • Supported by:
    National Natural Science Foundation of China(U1809214);National Natural Science Foundation of China(U23A20263);National Natural Science Foundation of China(51708504);Natural Science Foundation of Zhejiang Province(LY20E080014);Natural Science Foundation of Zhejiang Province(LTGN23E080001);Science and Technology Project of Zhoushan(2022C41011);and the Open Cooperation Foundation of the Department of Chemical Science of Henan University

Abstract:

The industrial implementation of Solar-driven photocatalysis is hampered by inefficient charge separation, poor reusability and hard retrieval of powdery catalysts. To conquer these drawbacks, a self- floating S-scheme Bi4O5Br2/P-doped C3N4/carbon fiber cloth (BB/PN/CC) composed of carbon fibers (CC) as the core and Bi4O5Br2/P-doped C3N4 (BB/PN) nanosheets as the shell was constructed as a competent, recyclable cloth-shaped photocatalyst for safe and efficient degradation of aquacultural antibiotics. The BB/PN/CC fabric achieves an exceptional tetracycline degradation rate constant of 0.0118 min‒1, surpassing CN/CC (0.0015 min‒1), BB/CC (0.0066 min‒1) and PN/CC (0.0023 min‒1) by 6.9, 0.8 and 4.1 folds, respectively. Beyond its catalytic prowess, the photocatalyst’s practical superiority is evident in its effortless recovery and environmental adaptability. The superior catalytic effectiveness stems from the S-scheme configuration, which retains the maximum redox capacities of the constituent BB and PN while enabling efficient spatial detachment of photo-carriers. X-ray photoelectron spectroscopy (XPS), in-situ XPS, and electron paramagnetic resonance analyses corroborate the S-scheme mechanism, revealing electron accumulation on PN and hole retention on BB under illumination. Density functional theory calculations further confirm S-scheme interfacial charge redistribution and internal electric field formation. This study advances the design of macroscopic S-scheme heterojunction photocatalysts for sustainable water purification.

Key words: Bi4O5Br2/P-doped C3N4, Self-floating S-scheme heterojunction, Internal electric field, Photocatalysis, Antibiotic removal